1. Office of the Director, Division of Viral and Rickettsial Diseases, National Center for Infectious Diseases, Centers for Disease Control and Prevention, US Department of Health and Human Services, Atlanta, Georgia
2. Respiratory and Enteric Viruses Branch, Division of Viral and Rickettsial Diseases, National Center for Infectious Diseases, Centers for Disease Control and Prevention, US Department of Health and Human Services, Atlanta, Georgia
3. Epidemiology Program, Office of Public Health, Indian Health Service Headquarters, US Department of Health and Human Services, Albuquerque, New Mexico
4. Indian Health Service, US Department of Health and Human Services, Rockville, Maryland
5. Alaska Native Tribal Health Consortium and Arctic Investigations Program, National Center for Infectious Diseases, Centers for Disease Control and Prevention, US Department of Health and Human Services, Anchorage, Alaska